Through the seismic wave exploration by us in A2 and A3 working faces, the conditions, velocity, frequency and penetrating distance of seismic wave in the main mining seams are understood preliminary.
A penetrating opening is formed by irradiating a light-transmitting insulating film with laser light having high intensity and a pulse high in repetition frequency.
通过使用具有高强度和高重复频率的激光照射透光绝缘膜来形成穿透开口。
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Ground Penetrating Radar (GPR) is a geophysical prospecting method by using reflection of high-frequency electromagnetic wave to detect target and underground medium distribution.